volume 29, number 1 november 2021 - amateurastronomy.org

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Hamilton Amateur Astronomers Event Horizon November 2021 Page 1 From The Editor Chair’s Report by Bernie Venasse The start of a new HAA Membership Year ushers in a new HAA Council. And, this year, we welcome back Bernie Venasse as HAA Chair. Clear Skies, Bob Christmas, Editor editor ‘AT’ amateurastronomy.org John Gauvreau. What a tough act to follow! John has been chairman of this club for many years. He has guided us through good times and not-so-good times and is now going to enjoy a well-deserved rest. Not to say that he is going to be idle. He has plans for the Beginners group which he will soon reveal to us. Thank you, John, for your guidance and perseverance during the past three terms chairing this wonderful club. Welcome !!! During my three-year break from the chair, I was able to concentrate on a few Goal Oriented Observing programs and awards as well as a few club projects. We now have an active award program which includes the Pathfinder program for newbies, the Rising Star award for novices and the Messier Program for more experienced observers. I hope to expand the program to include a Lunar IN THIS ISSUE: § HAA Explorers § The Sky This Month for November 2021 § What’s Up in Awards, November 2021 § NASA Night Sky Notes Contact Information (Continued on page 2 ) Volume 29, Number 1 November 2021

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Hamilton Amateur Astronomers Event Horizon November 2021 Page 1

From TheEditor

Chair’s Report by Bernie Venasse

The start of a newHAA Membership Yearushers in a new HAACouncil. And, thisyear, we welcomeback Bernie Venasseas HAA Chair.

Clear Skies,

Bob Christmas, Editor

editor ‘AT’amateurastronomy.org

John Gauvreau. What a tough act to follow!

John has been chairman of this club for many years. He has guided us throughgood times and not-so-good times and is now going to enjoy a well-deservedrest. Not to say that he is going to be idle. He has plans for the Beginners groupwhich he will soon reveal to us. Thank you, John, for your guidance andperseverance during the past three terms chairing this wonderful club.

Welcome !!!

During my three-year break from the chair, I was able to concentrate on a fewGoal Oriented Observing programs and awards as well as a few club projects.We now have an active award program which includes the Pathfinder programfor newbies, the Rising Star award for novices and the Messier Program for moreexperienced observers. I hope to expand the program to include a Lunar

IN THIS ISSUE:

§ HAA Explorers§ The Sky This Month for November 2021

§ What’s Up in Awards, November 2021§ NASA Night Sky Notes Contact Information

(Continued on page 2)

Volume 29, Number 1November 2021

Hamilton Amateur Astronomers Event Horizon November 2021 Page 2

Masthead Photo: M33, the Triangulum Galaxy, October 6, 2021, by Bob Christmas.

Taken with a Canon 40D through a Tamron 300mm f/2.8 telephoto lens, on a Super Polaris EQ mount.Exposures: 40 x 90 seconds @ ISO 1600; 60 minutes total. Crop of original image. North is to the left.

Chair’s Report (continued)

Observing award program soon. As well, several monographs are nearing completion and I look forwardto having them posted on the club website.

I am looking forward to serving as Chair once again. This is an exciting time to be involved in this science.There is an almost-total Partial Lunar Eclipse on November 19th and a Total Lunar Eclipse in May 2022. InDecember the James Webb Space Telescope will take flight, and hopefully, we will soon be returning toface-to-face meetings – or perhaps a hybrid form of meeting.

Our 2021-2022 Council includes many returning faces and I welcome Paula Owen as our new MembershipDirector.

Dr. Laura Rosseau-Nepton of the Canada-France-Hawaii Telescope was our guest speaker in October. Shegave us a very informative entertaining and enthusiastic presentation. Merci, Laura!

REMINDER…. Clocks go back on the 7th this month. I’m darned if I can find the store receipt so I can takemine back!

H.A.A.’s Loaner Scope Program

We at the HAA are proud of our Loaner ScopeProgram. It allows members who don’t own atelescope to get more up close with the nightsky, and it allows members to explore differenttypes of telescopes! Paid members are welcometo borrow a telescope for one month. We havetelescopes of varying expertise levels, aMallinCam, a spotter scope and variouseyepieces. Please visit the HAA website for moreinformation!

If you are interested in borrowing a telescope,please contact Melissa Whitman at

[email protected].

Telescopes are loaned out on a first come basis.

Hamilton Amateur Astronomers Event Horizon November 2021 Page 3

HAA Explorers by Jo Ann Salci

…A column for young astronomers - and those young at heart!

Last month we learned about our solar system which includes the planets that orbit our star, the Sun. Thismonth we are going to explore exoplanets; planets that orbit other stars!

Is there another Earth out there?

The first exoplanets were discovered in the mid 1990s. Now with the help of more powerful telescopesand satellites, exoplanets are being found more easily. Exoplanets are being studied right here in Canadaat The University of Montreal’s Institute for Research on Exoplanets (iREX). The Kepler Mission ran from2009 – 2018 and found thousands of exoplanets. NASA’s TESS, which launched in 2018 and stands for“Transiting Exoplanet Survey Satellite”, will be taking pictures of over a million stars as it looks forexoplanets.

So why do we use telescopes such as Kepler and TESS in space? The biggest advantage is that our atmospheredoesn’t get in the way of good views of space. These telescopes are very powerful and can capture a lotof detail. Watch for the launch of the James Webb telescope on December 18th, which will also be searchingfor exoplanets.

Exoplanets are being found in a variety of sizes, densities and types. Some are large gas giants like Jupiterand others are smaller rocky planets like Earth. Others are covered in molten lava and still others arecovered in ice. Some orbit their star quickly and others are much slower. We can learn a lot about ourown solar system by studying exoplanets and their stars. The hope is that one day we will find an exoplanet,or exoplanets, that have conditions suitable for life.

So far, 4,538 (as of Oct 25, 2021) exoplanets have been discovered with another 7,852 objects being studied!Although there are a few ways to find exoplanets, most are found as they pass in front of their star. Thisis known as a “transit”.

Kepler TelescopeImage Credit: NASA

TESSImage Credit: NASA

(Continued on page 4)

Hamilton Amateur Astronomers Event Horizon November 2021 Page 4

HAA Explorers (continued)

When an exoplanet transits its star, it blocks some of the star’s light (like a solar eclipse). We can detectthis dip in light which helps us find them. Not only can we find them, but we can also determine theirsize, how long it takes them to transit, and even what the planet’s atmosphere contains. Examples oftransits that occur closer to us are when Venus and Mercury transit our sun.

Ever wonder how exoplanets are named? They’re usually named after the star they orbit, or the telescope,or survey that found it. Remember exoplanets Wolf 359b and Wolf 359c we learned about? Wolf was thelast name of the astronomer that found the star. So, the exoplanets are named after the star. It was the359th red dwarf star that Max Wolf found. And “b” and “c” are the order the exoplanets were found.The letter “a” isn’t used because the exoplanet’s star is considered as the first to be discovered. Maybethere’s an exoplanet out there waiting for your name!

Things to do until next time**:

** Check with your parents or caregivers before checking out websites.

1. Visit https://exoplanets.nasa.gov/discovery/exoplanet-catalog/ to see the most up-to-date listing ofexoplanets.

2. Visit https://spaceplace.nasa.gov/search/exoplanets/ to learn much more about exoplanets.

3. Visit https://www.nasa.gov/mission_pages/webb/main/index.html to learn more about the JamesWebb Space Telescope.

(Continued on page 5)

Image Credit: NASA

Hamilton Amateur Astronomers Event Horizon November 2021 Page 5

HAA Explorers (continued)

During November, check out:

1. Wednesday, November 10th at 6:30 p.m.: See Jupiter, Saturn, the Moon and Venus in the Southernsky (see Figure 1 on page 6).

2. Friday, November 19th at 4:00 a.m. (for early birds!): A partial lunar eclipse in the Western sky(see Figure 2 on page 6).

Finally:

What did TESS say to the exoplanet’s star? Answer:

If you have a question you would like answered in the newsletter, please send it [email protected].

Thank you to Mi for reviewing this article!

Answers on page 16.

In Search of Exoplanets

You’re one in a million!

Thewordsearch.com

(Continued on page 6)

Hamilton Amateur Astronomers Event Horizon November 2021 Page 6

HAA Explorers (continued)

References:

www.NASA.govNational Geographic Kids: Ultimate Space Atlas. 2017.Exploring Exoplanets PPT presentation. RASC, Jenna Hinds, 2021.

Figure 2 - Partial Lunar Eclipse November 19, 2021. Image generated using Stellarium

Figure 1 - Jupiter, Saturn, the Moon and Venus November 10, 2021. Image generated using Stellarium

Hamilton Amateur Astronomers Event Horizon November 2021 Page 7

The Sky This Month for November 2021 by Matthew Mannering

This month the Moon is going to put on a good show, if you can stay up all night or get up very early.On Friday November 19th, the Moon will undergo a partial eclipse that will reach maximum at 4:03 EST.97.5% of the Moon will be within the umbra so it will take on that ruddy red colour we like to see. TheMoon begins to move into the umbra at 2:18 am, reaches maximum at 4:03 am and leaves the umbra at5:47 am. The umbra is the darkest part of the Earth’s shadow. I have included a chart from‘dateandtime.com’ that gives the full details of the eclipse.

This will be a great photoopportunity using just about anykind of camera and a tripod.Bhphotovideo has a great articlethat explains everything you needto know to take a great photo ofthe eclipse. Here is the link.

https://www.bhphotovideo.com/explora/photography/tips-and-s o l u t i o n s / 2 2 - t i p s - f o r -photographing-a-lunar-eclipse

The Coles Notes version for apartial eclipse that moves almostcompletely into the umbra, is totry the following settings as a startpoint for the exposure; ISO 400 atF/5.6 and 1/60 second.

Sunday November 7th is the daywe move back to Eastern StandardTime. Here are some events towatch out for in the month ofNovember beginning on the 7th.

7th – 6pm the 3.5 day old Moon isplaced 3.5° from Venus low in thewest.

10th – 7pm the Moon is 6° fromSaturn.

11th – 7pm the Moon is 5° fromJupiter.

13th – 6pm Venus will form a 3°triangle with globulars M22 andM28 low in the west.

13th – 9pm using binoculars, look for Neptune 4.5° above the Moon.

17th – 9:45pm using binoculars, look for Uranus 1.5° above the Moon.

(Continued on page 8)

Hamilton Amateur Astronomers Event Horizon November 2021 Page 8

The Sky This Month for November 2021 (continued)

Jupiter and Saturn start the month due south in the evening sky. However, because of the time changeon the 7th, the whole sky will appear to shift 15° further west along the ecliptic at the same time of night.At month end, Saturn will set at 9pm followed by Jupiter at 10:30pm. The reality is that the view of theplanets in a telescope suffers greatly from atmospheric turbulence, especially when the planets are within20° of the horizon. This means that by the end of November you will need to have any observations ofSaturn completed by about 7pm and Jupiter by 8:30pm.

The winter constellations are almost ready to take their place in the eastern evening sky. At the beginningof November at 9pm Gemini and Orion sit on the horizon. By month end they will be well clear of thehorizon along with Taurus and the Pleiades.

At mid month you can start looking for the star Tianguan in Taurus. Once you find this star, look for theCrab Nebula (M1) about 1.1° above it. The Crab at 8 arc minutes is much smaller and dimmer than picturesmake it appear. It’s very common for observers to have trouble seeing this nebula, so don’t be too upsetif you don’t find it the first time.

While you are in the neighborhood, look for the ‘Ruby Star’ (119 Tauri; above) which is about 3° east ofTianguan. This is one of the reddest stars in the sky and at magnitude 4.3 it should be an easy catch inbinoculars. Its colour can be compared to Aldebaran (also in Taurus) and the ‘Garnet Star’ (Mu Cephei;top of page 9) in Cepheus.

The Ruby Star and M1 in Taurus. Image generated using Stellarium

(Continued on page 9)

Hamilton Amateur Astronomers Event Horizon November 2021 Page 9

The Sky This Month for November 2021 (continued)

I am really looking forward to the partial lunar eclipse this month. Of course, I would look forward to iteven more if it wasn’t in the dead of night. Lunar eclipses may not be extremely rare, but they are not acommon sight either. Let’s hope for some clear nights so that we can enjoy the Moon, Planets, red starsand the rest of the night sky.

The Garnet Star in Cepheus. Image generated using Stellarium

“HAA Presents”

Members of the public of any age in the GTHA can now request an in-person (once it is safe to do so) orvirtual presentation from the HAA directly on our website.

Simply navigate to www.amateurastronomy.org and select “Contact” from the top menu bar and then clickon “HAA Presents” (see image below). You will be presented with a request form and once all requiredfields are entered, click on the “Submit” button and you will see a confirmation message that your requesthas been successfully submitted.

Once received, our Public Education Director, Jo Ann Salci, will respond to your request within 5 businessdays to discuss next steps. If you have any questions, feel free to send an email [email protected].

Hamilton Amateur Astronomers Event Horizon November 2021 Page 10

What’s Up in Awards? November 2021 by Bernie Venasse

Contents:

What’s up in awards?Pathways Observing Program targets… November 2021Rising Star Program: November, December Timely Meteor ShowersMessier Observing Program: November, December... Including target hints!!Upcoming Meteor showersAAVSO Webinars

What’s Up in Awards?

The Hamilton Amateur Astronomers Observing Programs are designed to provide direction for amateurastronomer’s observations and to reward their accomplishments. A certificate is awarded when the goalsof the observing program are met. The HAA offer various certificates based upon achieving specific observinggoals. There is no time limit for completing the required observing but good record keeping is required.Each observer must perform all the requirements of each Observing Program themselves. However,observers are able to receive help from (an)other observer(s) as they learn to find and identify differentobjects. Each observer will then need to locate and observe the object on their own to meet the goals ofthe program. Observing logs will be submitted to and examined by the HAA Observing Programs ProjectCoordinator to confirm all observations before a certificate is granted.

This column tells you which objects are visible this next month for the HAA Observing Programs and othersights of interest.

HAA Rising Star Observing Award

November DecemberConstellations: Cassiopeia Constellations: Taurus, PerseusStars: Schedar Stars: HamalDouble stars: Almach, Mesarthim Double stars: AlcyoneObject Pairs: M31/M32, NGC133/NGC146, NGC436/NGC457 Object Pairs: NGC 1325, NGC 1332Messier objects: M33 Messier objects: M45

Pathways Observing Program

Observable this season: October, November, DecemberGroup C,Autumn Constellations: Find, observe, sketch: Perseus, Cygnus, Lyra.Stars: Find, observe, sketch: Algol, Deneb, Fomalhaut.Asterisms: Find, observe, sketch: Great Square, Northern Cross, Circlet.Planet: Any one planet that is remaining in the list.

HAA Messier Objects Observing Award

November Messier targets

This month we will search for seven more objects from the Messier Catalog. These include four globularclusters, the largest and the smallest planetary nebulas in the catalog, and a small oddity.

(Continued on page 11)

Hamilton Amateur Astronomers Event Horizon November 2021 Page 11

What’s Up in Awards? November 2021 (continued)

M57 This smallest planetary nebula in the Messier Catalog is the famous Ring nebula in the constellationLyra. Low power telescope views show a very small blue/green disk, not much bigger than a star.Medium to high power will magnify the size of the nebula while leaving the surrounding stars thesame size, confirming you have found it.

M56 Look for a small round ball of light, slightly brighter in the center.M27 Also known as the Dumbbell nebula, the largest planetary nebula in the Messier Catalog. This object

lies in the constellation Vulpecula. In small to medium scopes it appears as a rectangular patch oflight. In large scopes it may even appear round in shape with a bright rectangular, or dumbbellshaped core.

M71 Lying in Sagitta, this globular cluster appears as a faint oval hazy patch of light in a telescope.M30 Telescopes show a small fuzzy ball of light, bright in the center fading to the edges.M72 This is a small faint globular cluster in Aquarius. Look for a faint oval patch of light, gradually

brighter towards the middle.M73 This asterism is located near M72 in Aquarius. In a low power telescope view it looks like a very

small fuzzy patch of light at first glance. When stared at it reveals itself as a small collection ofstars. Medium to high power shows the view best described by Messier "cluster of three or fourstars… containing very little nebulosity".

December Messier targets

This month we will view two small but bright globular clusters, two open star clusters, and the grandestgalaxy in the sky along with it's two companions.

M2 This is a small, bright globular cluster in Aquarius. A low power telescope field will show a roundfuzzy patch, brighter in the center and fading to the edge, in a field with no other bright objects.

M15 This globular cluster in Pegasus is very similar to M2 in size and brightness, except it is surroundedby several bright stars. Best view is through a telescope at medium to high power.

M29 This galactic cluster is a small, sparse group of stars in Cygnus. A telescope will easily resolve themembers of this cluster.

M39 Dark skies will allow this large, bright cluster in Cygnus to be seen with the naked eye as a hazypatch of light. Binoculars easily resolve this cluster into it's bright and widely scattered membersand provide a better view than can be seen with most telescopes.

M31 This is the famous Andromeda Galaxy, our closest galactic neighbor, and the largest, brightest galaxyto be seen in the northern sky. The ability to see M31 with the naked eye provides a good test ofthe darkness of your skies. M31 is so large that binoculars provide the best view, allowing the entiregalaxy to be seen in one field of view. Look for an elongated patch of light, with a bright, roundcentral core.

M32 This is an elliptical companion galaxy to M31. Through a telescope look for a slightly oval ball offuzz in the same low power field as the core of M31.

M110 This is another elliptical companion galaxy to M31, lying on the opposite side of the core as M32.Through a telescope look for a large, oval patch of light. Although M110 is as bright as M32 it ismuch larger and thus has a lower surface brightness making it a difficult object in light pollutedskies.

The Planets… November 2021 via (BBC) Sky at Night Magazine

Mercury Well-positioned morning planet at the start of November, rises two hours before sunrise. Marslies nearby on 15 November.Venus Bright evening planet, low and poorly positioned. Waxing crescent Moon nearby on 7 and 8 November.Mars Morning object. Near Mercury on 10 and 11 November and 3.6 arcminutes from Zubenelgenubi (Alpha-2(α2) Librae) on 22 November.

(Continued on page 12)

Hamilton Amateur Astronomers Event Horizon November 2021 Page 12

What’s Up in Awards? November 2021 (continued)

Jupiter Evening planet. A first quarter Moon is near on 11 November.Saturn Evening planet. A 41%-lit waxing crescent Moon is near on 10 November.Uranus Opposition on 4 November. An almost full Moon is 1.8º south on the morning of 18 November.Neptune Well positioned binocular planet near Phi (φ) Aquarii, reaches 30º altitude all month.

Meteor Showers via American Meteor Society

Southern Taurids

Period of activity: September 28th, 2021 to December 2nd, 2021Peak Night: Nov 4-5, 2021

The Southern Taurids are a long-lasting shower that several peaks during its activity period. The shower isactive for more than two months but rarely produces more than five shower members per hour, even atmaximum activity. The Taurids (both branches) are rich in fireballs and are often responsible for increasednumber of fireball reports from September through November.

Shower details - Radiant: 03:35 +14.4° - ZHR: 5 - Velocity: 17.2 miles/sec (slow - 27.7km/sec)Parent Object: 2P/EnckeNext Peak - The Southern Taurids will next peak on the Nov 4-5, 2021 night. On this night, the moon willbe 0% full.

Northern Taurids

Period of activity: October 13th, 2021 to December 2nd, 2021Peak Night: Nov 11-12, 2021

This shower is much like the Southern Taurids, just active a bit later in the year. When the two showersare active simultaneously in late October and early November, there is sometimes a notable increase inthe fireball activity. There seems to be a seven year periodicity with these fireballs. 2008 and 2015 bothproduced remarkable fireball activity. 2022 may be the next opportunity.

Shower details - Radiant: 03:55 +22.8° - ZHR: 5 - Velocity: 18 miles/sec (slow - 30km/sec)Parent Object: 2P/EnckeNext Peak - The Northern Taurids will next peak on the Nov 11-12, 2021 night. On this night, the moonwill be 55% full.

Leonids

Period of activity: November 3rd, 2021 to December 2nd, 2021Peak Night: Nov 17-18, 2021

The Leonids are best known for producing meteor storms in the years of 1833, 1866, 1966, 1999, and 2001.These outbursts of meteor activity are best seen when the parent object, comet 55P/Tempel-Tuttle, isnear perihelion (closest approach to the sun). Yet it is not the fresh material we see from the comet, butrather debris from earlier returns that also happen to be most dense at the same time. Unfortunately, itappears that the earth will not encounter any dense clouds of debris until 2099. Therefore, when the cometreturns in 2031 and 2064, there will be no meteor storms, but perhaps several good displays of Leonidactivity when rates are in excess of 100 per hour. The best we can hope for now until the year 2030 ispeaks of around 15 shower members per hour and perhaps an occasional weak outburst when the earthpasses near a debris trail. The Leonids are often bright meteors with a high percentage of persistent trains.

(Continued on page 13)

Hamilton Amateur Astronomers Event Horizon November 2021 Page 13

What’s Up in Awards? November 2021 (continued)

Leonids (continued)Shower details - Radiant: 10:17 +21.6° - ZHR: 15 - Velocity: 43.5 miles/sec (swift - 70km/sec)Parent Object: 55P/Tempel-TuttleNext Peak - The Leonids will next peak on the Nov 17-18, 2021 night. On this night, the moon will be 98%full.

Geminids

Period of activity: November 19th, 2021 to December 24th, 2021Peak Night: Dec 13-14, 2021

The Geminids are usually the strongest meteor shower of the year and meteor enthusiasts are certain tocircle December 13 and 14 on their calendars. This is the one major shower that provides good activityprior to midnight as the constellation of Gemini is well placed from 22:00 onward. The Geminids are oftenbright and intensely colored. Due to their medium-slow velocity, persistent trains are not usually seen.These meteors are also seen in the southern hemisphere, but only during the middle of the night and at areduced rate.

Shower details - Radiant: 07:24 +32.3° - ZHR: 150 - Velocity: 21 miles/sec (medium - 34km/sec)Parent Object: 3200 Phaethon (asteroid)Next Peak - The Geminids will next peak on the Dec 13-14, 2021 night. On this night, the moon will be78% full.

Ursids

Period of activity: December 13th, 2021 to December 24th, 2021Peak Night: Dec 21-22, 2021

The Ursids are often neglected due to the fact it peaks just before Christmas and the rates are much lessthan the Geminds, which peaks just a week before the Ursids. Observers will normally see 5-10 Ursids perhour during the late morning hours on the date of maximum activity. There have been occasional outburstswhen rates have exceeded 25 per hour. These outbursts appear unrelated to the perihelion dates of comet8P/Tuttle. This shower is strictly a northern hemisphere event as the radiant fails to clear the horizon ordoes so simultaneously with the start of morning twilight as seen from the southern tropics.

Shower details - Radiant: 14:36 +75.3° - ZHR: 10 - Velocity: 20.5 miles/sec (medium - 33km/sec)Parent Object: 8P/TuttleNext Peak - The Ursids will next peak on the Dec 21-22, 2021 night. On this night, the moon will be 93%full.

AAVSO Webcasts

November 6 Annual MeetingNovember 13 (1) Dr. David Turner (2) Dr Johm ThorstensenNovember 27 (1) Dr Kristine Larsen (2) Gabriel MurawskiDecember 4 AAVSO-SloohDecember 11 TBA

Please feel free to contact me with any questions or comments at [email protected]

— Bernie

Hamilton Amateur Astronomers Event Horizon November 2021 Page 14

NASA Night Sky Notes

Fall and winter months bring longer nights, and with these earlier evenings, even the youngest astronomerscan get stargazing. One of the handiest things you can teach a new astronomer is how to measure the sky –and if you haven’t yet learned yourself, it’s easier than you think!Astronomers measure the sky using degrees, minutes, and seconds as units. These may sound more liketerms for measuring time - and that’s a good catch! – but today we are focused on measuring angulardistance. Degrees are largest, and are each made up of 60 minutes, and each minute is made up of 60seconds. To start, go outside and imagine yourself in the center of a massive sphere, with yourself at thecenter, extending out to the stars: appropriately enough, this is called the celestial sphere. A circle contains360 degrees, so if you have a good view of the horizon all around you, you can slowly spin around exactlyonce to see what 360 degrees looks like, since you are in effect drawing a circle from inside out, withyourself at the center! Now break up that circle into quarters, starting from due North; each quartermeasures 90 degrees, equal to the distance between each cardinal direction! It measures 90 degrees betweendue North and due East, and a full 180 degrees along the horizon between due North and due South. Now,switch from a horizontal circle to a vertical one, extending above and below your head. Look straight aboveyour head: this point is called the zenith, the highest point in the sky. Now look down toward the horizon; itmeasures 90 degrees from the zenith to the horizon. You now have some basic measurements for your sky.Use a combination of your fingers held at arm’s length, along with notable objects in the night sky, to makesmaller measurements. A full Moon measures about half a degree in width - or 1/2 of your pinky finger,since each pinky measures 1 degree. The three stars of Orion’s Belt create a line about 3 degrees long. Thefamed “Dig Dipper” asterism is a great reference for Northern Hemisphere observers, since it’s circumpolarand visible all night for many. The Dipper’s “Pointer Stars,” Dubhe and Merak, have 5.5 degrees betweenthem - roughly three middle fingers wide. The entire asterism stretches 25 degrees from Dubhe to Alkaid -roughly the space between your outstretched thumb and pinky. On the other end of the scale, can you splitMizar and Alcor? They are separated by 12 arc minutes - about 1/5 the width of your pinky.Keep practicing to build advanced star-hopping skills. How far away is Polaris from the pointer stars of theBig Dipper? Between Spica and Arcturus? Missions like Gaia and Hipparcos measure tiny differences in theangular distance between stars, at an extremely fine level. Precise measurement of the heavens is known asastrometry. Discover more about how we measure the universe, and the missions that do so, at nasa.gov.

Measure the Night Sky

David Prosper

(Continued on page 15)

This article is distributed by NASA Night SkyNetwork.

The Night Sky Network program supports astronomyclubs across the USA dedicated to astronomy outreach.

Visit nightsky.jpl.nasa.gov to find local clubs, events,and more!

Hamilton Amateur Astronomers Event Horizon November 2021 Page 15

NASA Night Sky Notes (continued)

Image created with assistance from Stellarium

Hamilton Amateur Astronomers Event Horizon November 2021 Page 16

HAA Helps Hamilton

While during the pandemic, the H.A.A.hasn’t been able to collect donationsfrom our members and guests for localfood banks at our general meetings, theH.A.A. has always valued itsrelationships with food banks in thecommunity, particularly Hamilton FoodShare.

In that spirit, we encourage you tocontinue making donations directly toyour local food banks.

Word Search Answers:

Hamilton Amateur Astronomers Event Horizon November 2021 Page 17

2021-2022 Council

November 12, 2021 - 7:30 pm — Virtual Online H.A.A. Meeting. Our main speaker will beSimon Poole, First VP of the Royal Astronomical Society of Canada (and president of theRASC Calgary Centre). Topic: The voyages of Nicolas de Lacaille, an 18th century Frenchastronomer who catalogued southern hemisphere stars and constellations.

Due to the COVID-19 Coronavirus pandemic, the meeting will be conducted on the platformZoom. Be on the lookout for an invitation e-mail with a meeting link. You may downloadthe Zoom app for various platforms from Zoom’s Download Center.

We hope to return to in-person meetings very soon!

All active HAA members have the privilege ofaccess to an exclusive HAA members only

dark sky location.

Be on the lookout for e-mails with dark skyobserving details. Space is limited.

Check out the H.A.A. Websitewww.amateurastronomy.org

Follow us!

UPCOMING EVENTS

Contact UsHamilton Amateur Astronomers

PO Box 65578Dundas, ON

L9H 6Y6

www.amateurastronomy.org

General Inquiries: [email protected]

Membership:[email protected]

Meeting Inquiries:[email protected]

Public Events:[email protected]

Observing Inquiries:[email protected]

Education:[email protected]

Newsletter:[email protected]

Digital Platforms Director:[email protected]

Chair Bernie Venasse

Second Chair Christopher Strejch

Treasurer Ann Tekatch

Digital Platforms Director Christopher Strejch

Membership Director Paula Owen

Observing Director Matthew Mannering

Education Director Jo Ann Salci

Event Horizon Editor Bob Christmas

Recorder Brenda Frederick

Secretary Denise White

Publicity Director Mario Carr

Councillors at Large To be confirmed bythe new council